June 24, 2021
Outages are awful for users and teams alike. What can we learn from them when they happen?
On May 12, 2020, Slack had its first significant outage in a long time. We published a summary of the incident shortly after, but this story is an interesting one, and we’d like to go into more detail on the technical issues around it.
The user-visible outage began at 4:45pm Pacific time, but the story really begins around 8:30am that morning. Our Database Reliability Engineering team was alerted about a significant load increase in part of our database infrastructure at the same time as our Traffic team received alerts that we were failing some API requests.
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June 24, 2021
